Ish.
It’s hard to do because of how different LEDs have different lumen levels, and in the FET modes, it also depends a lot on battery type and voltage.
Aside from that though, basically you’d have to look up the PWM values from the firmware’s ramp table, calculate the power level, then look up that power level on an emitter test graph.
Or try the bin/level_calc.py tool, which produces a relatively naive estimate of how many lumens it expects. These numbers may not match actual measurements though, because it doesn’t know the emitter’s response curve and may have been given intentionally wrong values in order to force the graph into a particular shape. Like, for the D4S, I told the calculator the lowest level was 11.2 lm and the highest was 4000 lm, and that it should use a ninth-root curve shape, because this got the values to line up how I wanted. But in reality it’s more like 0.3 lm to 5000 lm.